All parts are the same and interchangeable except the iron (SB1) or steel(SB2) the recievers are made of, if you are speaking of the rifle SB2 reciever and not the 10 gauge shotgun SB2 reciever, thats a different story. So yes, the forearm spacers are interchangeable. There are however at least 3 different thinkness's used for proper forearm fitting, but the difference is only a few thousandt's or so so they can be fitted (or switched) if there is a problem....<><.... :grin:
Bernie, you can make a forend fit tighter and therefore stiffen the action by adding a shim between the spacer and forend. I use aluminum furnace tape, when trimmed to fit, it can't be seen and is .004" thick with the backing removing, it makes a loose fitting forend snug and you can use multiple pieces if one doesn't help. You can also flat sand a spacer thinner if needed, but I've only had to do that once, so it's probably not likely to happen much.
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